National Geographic Society. (1979). Mysteries of the ancient world. National Geographic Society.
Citazione stile Chigago Style (17a edizione)National Geographic Society. Mysteries of the Ancient World. Washington, D.C: National Geographic Society, 1979.
Citatione MLA (9a ed.)National Geographic Society. Mysteries of the Ancient World. National Geographic Society, 1979.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.